Deferred Compensation Benefits - Text (Details) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Deferred Compensation Text Details [Line Items]
Amounts not recognized as net periodic benefit, net of tax	$ (5,168,000)	$ (6,426,000)	$ (3,606,000)
Pension loss (benefit) adjustment, net of tax	(1,258,000)	2,820,000	1,743,000
ESBP
Deferred Compensation Text Details [Line Items]
Net periodic pension cost	434,000	617,000	616,000
Benefit obligation	7,499,000	8,405,000	9,508,000
Comprehensive pension gain (loss), net of tax	(400,000)	(600,000)
Discount rate	3.87%	3.02%
Change in discount rate	0.85%
Estimated future employer contributions, next year	700,000
Increase (decrease) in plan liabilities	(500,000)
Amounts not recognized as net periodic benefit, net of tax	1,300,000	1,700,000
Non Employee Director Deferred Compensation Plan [Member]
Deferred Compensation Text Details [Line Items]
Employer contributions	100,000	100,000	100,000
NDBP
Deferred Compensation Text Details [Line Items]
Net periodic pension cost	49,000	118,000	77,000
Benefit obligation	11,635,000	11,913,000	7,925,000
Discount rate	3.20%	2.80%
Change in discount rate	0.40%
Increase (decrease) in plan liabilities	(1,000,000)
Targeted minimum return	4.00%	4.00%
Guaranteed rate of return	4.00%	4.00%
Amounts not recognized as net periodic benefit, net of tax	3,900,000	4,800,000
Key Employee Non Qualified Deferred Compensation Plan
Deferred Compensation Text Details [Line Items]
Estimated future employer contributions, next year	200,000
Employer contributions	300,000	400,000	300,000
ESBP and NDBP [Member]
Deferred Compensation Text Details [Line Items]
Pension loss (benefit) adjustment, net of tax	(800,000)	(2,100,000)	(1,100,000)
Amount to be recognized as components of net periodic benefit in next year	$ 200,000